R-T-B RARE EARTH MAGNET POWDER, METHOD OF PRODUCING R-T-B RARE EARTH MAGNET POWDER AND BOND MAGNET

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This invention provides an R-T-B rare earth magnet powder which does not contain elements that are expensive, scarce resources such as Dy, which can be produced without additional processes outside of the HDDR process, and which has excellent coercivity. This invention relates to an R-T-B rare earth magnet powder comprising a grain boundary phase and crystal grains containing an R2T14B magnetic phase, the composition of the grain boundary phase comprising 13.5-35.0 at.% of R, 1.0-7.0 at.% of Al, wherein said powder is obtainable by controlling, during the process of HDDR treatment of the raw material alloy, the heat treatment conditions in the DRI step of the HDDR process.